diff options
Diffstat (limited to 'src/include/storage/backendid.h')
| -rw-r--r-- | src/include/storage/backendid.h | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h index 50ac982da19..01387723f79 100644 --- a/src/include/storage/backendid.h +++ b/src/include/storage/backendid.h @@ -14,11 +14,15 @@ #ifndef BACKENDID_H #define BACKENDID_H -/* ---------------- - * -cim 8/17/90 - * ---------------- +/* + * BackendId uniquely identifies an active backend or auxiliary process. It's + * assigned at backend startup after authentication. Note that a backend ID + * can be reused for a different backend immediately after a backend exits. + * + * Backend IDs are assigned starting from 1. For historical reasons, BackendId + * 0 is unused, but InvalidBackendId is defined as -1. */ -typedef int BackendId; /* unique currently active backend identifier */ +typedef int BackendId; #define InvalidBackendId (-1) |